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On to the results. Participants, on average, saw large improvements in nearly every meaningful measure of health in just 10 days on the "paleolithic" diet. Remember, these people were supposedly healthy to begin with. Total cholesterol and LDL dropped, if you care about that. Triglycerides decreased by 35%. Fasting insulin plummeted by 68%. HOMA-IR, a measure of insulin resistance, decreased by 72%. Blood pressure decreased and blood vessel distensibility (a measure of vessel elasticity) increased. It's interesting to note that measures of glucose metabolism improved dramatically despite no change in carbohydrate intake. Some of these results were statistically significant, but not all of them. However, the authors note that:

In all these measured variables, either eight or all nine participants had identical directional responses when switched to paleolithic type diet, that is, near consistently improved status of circulatory, carbohydrate and lipid metabolism/physiology.

Paleolithic people also had better looking bodies than we do today with studies of modern hunter-gatherers, whose lifestyles still resemble the Paleolithic, confirming that they have the lowest fat to bodyweight ratios ever seen (Audette, 1999).

Yup, I have a freind who asserts that cavemen had what Casey Butt would call "unnatural" LBM (of course not as much total weight/mass as bodybuilders) and some of these studies point to that being a possibility.